4
OPERATION
The InSight II has numerous adjustment options available. It can be tuned either automatically or
manually to achieve the optimum level of sensitivity to the target flame balanced with superior dis-
crimination of background radiation.
The InSight II scanner measures the amplitude of the modulations (the flame “flicker”) that occur
within the targeted flame. The two sensors within the scanner measure these amplitudes seen within
the ultraviolet (UV) and infrared (IR) spectral ranges across a wide range of flicker frequency bands.
In addition the scanner has two independent flame relays (FR1 and FR2) that can be tied to the sen-
sors in logical configurations. It is possible to set up each flame relay to operate from the UV sensor,
the IR sensor, or both UV and IR sensors.
During the scanner set up procedure, the logical operation for the two flame relays is selected for the
desired sensors. In addition the operation and settings relative to user gain, required (flicker) fre-
quency band and switching thresholds for the relays are selected (refer to commissioning procedure
for more details on set up procedures)
The current Flame Signal Strength (FS) of the selected sensors can be viewed on the scanner display
via the main menu. This displayed value is the measure of amplitude within the selected modulation
(flicker) frequency band, for example:
FS 1: 850 2: 999 (Flame signal for selected sensors 0 to 999)
1: IR&UV 2: UV (Relay Logic operation = FR1 tied to IR & UV; FR2 tied to UV Only)
The scanner set-up procedure, the operation and settings relative to the sensor signals and each of the
two flame relays are chosen either in Auto Config or Manual Config mode to provide the optimum
flame ON/OFF discrimination.
The flame relays (FR1 and FR2) energize (and their normally open contacts close) when the flame
quality is at or above the programmed flame ON threshold for each relay and remain on until the
flame quality is at or below the programmed flame OFF threshold. Each relay operates with totally
independent settings meaning that the signal strength used can be at different gains and different fre-
quency bands. Each relay can also have independent timings and thresholds associated with it.
IMPORTANT NOTE
-
The FAULT RELAY is energized when the scanner is powered (24 vdc) and
when the scanner had successfully passed all internal self-checking routines. The Fault relay is de-
energized if there is a power interruption to the scanner or if the scanner has detected an internal
fault
.
APPLICATION
The InSight II
is best suited to multi-fuel applications that require the highest level of sophistication
and flexibility (addition choices of modulation frequencies, and the time-saving Auto Config func-
tion), and remote modbus communications capability (e.g. larger multi-burner boilers and furnaces).
The InSight II
scanner contains both the infrared and ultraviolet flame sensors described below.
The infrared flame sensor, responds to infrared radiation from 700 to 1700 nanometers wavelength.
The ultraviolet flame sensor, responds to ultraviolet radiation from 295 to 320 nanometers wave-
length.
Warning
-
Fireye recommends that the FAULT RELAY contacts MUST be wired in series
with the Flame relay contacts for maximum safety applications.
